We are a team in Italy who has to prepare a business plan for investor and we need to know how much does a marketplace and an e-commerce cost. A very good example of what we are thinking to do is www.cocontest.com. The solutions we are interested in, are:

• a marketplace solution  ( magento is preferred )
• an e-commerce solution that has to be a part of the marketplace
• the user interface experience
• the web design and the images
• everything we need to report and monitor the performance
• customer service and support